From David Copperfield
SOME of the higher scholars boarded in the Doctor's house and through them I learned, at second hand, some particulars of the Doctor's history. As, how he had not yet been married twelve months to the beautiful young lady I had seen in the study, whom he had married for love; for she had not a sixpence, and had a world of poor relations (so our fellows said) ready to swarm the Doctor out of house and home. Also, how the Doctor's cogitating manner was attributable to his being always engaged in looking out for Greek roots; which, in my innocence and ignorance, I supposed to be a botanical furore on the Doctor's part, especially as he always looked at the ground when he walked about, until I understood that they were roots of words, with a view to a new Dictionary which he had in contemplation. Adams our head-boy, who had a turn for mathematics, had made a calculation, I was informed, of the time this Dictionary would take in completing, on the Doctor's plan, and at the Doctor's rate of going. He considered that it might be done in one thousand six hundred and forty-nine years, counting from the Doctor's last, or sixty-second, birthday. But the Doctor himself was the idol of the whole school; and it must have been a badly-composed school if he had been anything else, for he was the kindest of men.
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Reference address : https://www.ellopos.net/elpenor/greeks-us/dickens-roots.asp